Ruling · Dāmodara Dvādaśī · 1958

Monday 25 August

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 14 s away. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Monday 25 August

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:56  12:44 madhyāhna ends
Dvādaśī begins 11:58:17
11:0811:3211:5612:2012:4413:0813:32

46 of 48 minutes covered, the last 46

Midday of Tuesday 26 August

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:56  12:44 madhyāhna ends
Dvādaśī ends 11:47:39
11:0811:3211:5612:2012:4413:0813:32

0 of 48 minutes covered

Dvādaśī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 11:58 on Mon 25 Aug to 11:48 on Tue 26 Aug.

    1958-08-25T03:58:18Z → 1958-08-26T03:47:40Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:56–12:44 on the 25th, 11:56–12:44 on the 26th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 46 of 48 minutes on the 25th and 0 of 48 on the 26th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 134 s < 300 s

  5. 05

    Ruling

    Dāmodara Dvādaśī, Baoding, 1958: Monday 25 August.

    confidence: boundary (margin)

Say it like this

In Baoding, Dāmodara Dvādaśī 1958 falls on Monday 25 August. Dvādaśī runs from 11:58 on Mon 25 Aug to 11:48 on Tue 26 Aug and covers 46 of 48 minutes of madhyāhna that midday. It is 2 min 14 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1958/damodara-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 25 Aug
Ahargaṇa, classicalDisc centre, no refractionMon 25 Aug
compat-drikpanchangComparison profileMon 25 Aug
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/damodara-dvadashi · ruleset 2026.3-draft

Month
Śrāvaṇa, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“S 12 Buddha dvadasi, Damodara dvadasi (purvaviddha), Visnu-pavitraropana.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 25thCoveredMadhyāhna 26thCoveredRuled
Los Angeles20:58 → 20:4812:3148 min12:300 min25 Aug
Chicago22:58 → 22:4812:2848 min12:280 min25 Aug
Jersey City23:58 → 23:4812:3448 min12:340 min25 Aug
Port of Spain23:58 → 23:4811:4448 min11:440 min25 Aug
London04:58 → 04:4812:3848 min12:380 min25 Aug
Durban05:58 → 05:4811:3448 min11:340 min25 Aug
Dubai07:58 → 07:4811:5748 min11:570 min25 Aug
Delhi09:28 → 09:1811:5948 min11:590 min25 Aug
Kolkata09:28 → 09:1811:1548 min11:140 min25 Aug
Singapore11:28 → 11:1812:1348 min12:130 min25 Aug
Sydney13:58 → 13:4811:340 min11:3348 min26 Aug
Suva15:58 → 15:4811:450 min11:4448 min26 Aug
Profile · tradition
pac-rp@2026.1 · smarta
Rule
damodara-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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